#include    <stdio.h>
#include    <stdlib.h>
#include    <unistd.h>

int main()
{
    int    fork_rv;

    printf("Before: my pid is %d\n", getpid());

    fork_rv = fork();        /* create new process    */

    if ( fork_rv == -1 )        /* check for error    */
        perror("fork");
    else if ( fork_rv == 0 ){ 
        printf("I am the child.  my pid=%d\n", getpid());
    
        exit(0);
    }
    else{
        printf("I am the parent. my child is %d\n", fork_rv);
        exit(0);
    }

    return 0;
}